# Contributing

## Development

This extension has no package manager or dependency install step. Edit the plain JavaScript, HTML, CSS, and manifest files directly.

Run the syntax checks before submitting changes:

```bash
node --check background.js
node --check popup/popup.js
```

## Manual Testing

1. Open `opera://extensions`.
2. Enable developer mode.
3. Load this folder as an unpacked extension.
4. Open the popup and verify cache clearing, timer save, timer disable, and status display.

## Security Expectations

- Do not add host permissions unless required by a documented feature.
- Do not add cookie, history, downloads, or tabs permissions without explicit review.
- Do not add external network calls.